Reduction by hydrogen of U3O8 into UO2:: Nucleation and growth, influence of hydration

被引：24
|
作者：
Brun, C [1 ]
Valdivieso, F [1 ]
Pijolat, M [1 ]
Soustelle, M [1 ]
机构：
[1] Ecole Natl Super Mines, Ctr SPIN, F-42023 St Etienne 2, France
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 1999年 / 1卷 / 03期
关键词：
D O I：
10.1039/a808365g
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The reduction of U3O8 by hydrogen has been studied by thermogravimetry in the range 510-600 degrees C and 1-40 kPa hydrogen partial pressure. The kinetic curves have been interpreted by a new model involving steps of nucleation and growth in which the rate limiting step of growth is located at the external interface. This allowed us to determine the variations in the areic nucleation frequency and the areic reactivity of growth as a function of hydrogen pressure and temperature. Mechanisms have been proposed which account for the variations in the areic nucleation frequency and reactivity of growth as a function of the partial pressure of hydrogen and the temperature of reduction. The influence of the hydration of UO3 prior to its reduction by hydrogen on the kinetics could also be explained by the same model. It was found to lower the areic nucleation frequency without changing the areic growth reactivity.
引用
收藏
页码：471 / 477
页数：7
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